China Unicom is actively involved in network open source projects and has conducted some SDN/NFV tests and field trials based on open source. This presentation will talk about network re-architecture based on open source SDN/NFV/Cloud from telecom operator’s perspective and discuss the trend and challenges of open networking technologies. China Unicom’s practice and lessons on open source networking projects will be introduced. The contents of this presentation include: China Unicom’s vision and activities on network re-architecture based on SDN/NFV/Cloud, main open source networking projects such as ONOS/CORD and OPNFV at China Unicom, lessons and challenges of open source and white boxes deployment for telecom operators.